8mm Forum: ELMO GP Dual 8 Projector

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Posted by Don Elsass (Member # 4669) on September 30, 2015, 08:31 AM:

The projector is quiet when running in reverse, but very noisy and squeaky when running forward. Do the plastic gears need to be lubricated? If so, what should be used? Is there something else that could be causing the noise?

Posted by Steve Klare (Member # 12) on September 30, 2015, 10:45 AM:

You could try this on your gears:

My Great Worm-Glop Weekend!

It may help, it can't hurt.

What kind of concerns me is that you have a squeak going forward but not in reverse. Bearings have a little bit of clearance in them, and this means that the sleeve and the shaft will contact each other in different spots depending on direction (and speed too) as friction causes the shaft to "walk" after it starts to rotate , so a bearing could actually be worn out in "Forward" yet still fine in "Reverse" since its spends hours in one direction and minutes in the other.

It's a good time to quiet the room and listen very carefully: figure out exactly where the sound is coming from.

Posted by Don Elsass (Member # 4669) on September 30, 2015, 06:24 PM:

The culprit is the bearing for the wind-up reel. I gave it a shot of WD-40 and noise was reduced some what. Do you know if a replacement bearing available?

Posted by Steve Klare (Member # 12) on September 30, 2015, 07:01 PM:

For better or worse this is a problem I've never had, so the honest answer is "I dunno!".

Here's a thought: WD-40 isn't really a lubricant, but rather a degreaser/cleaner. If you give it a couple of days to evaporate out, you could try again with a drop or two of 3 in 1 oil.

I guess the thing to do if the bearing really is shot is try to extract it, get some measurements (vernier caliper) and start poking around the 'net looking for replacements. (McMaster Carr?)

The nice thing about parts like bearings is manufacturers of all sorts of machines like to buy standard parts off the shelf: They are cheaper, more reliable and allow the companies to concentrate their Engineering time on their specialties and not have to deal with everything else.

-so there's a decent chance the bearing they used (or an equivalent) is still available. Not a certainty for sure, but a chance.

Posted by Andrew Woodcock (Member # 3260) on September 30, 2015, 07:30 PM:

I can honestly say I've never come across a standard ball or Roller bearing on any projector that isn't very easily obtainable from any standard engineering merchant.

It really shouldn't be issue sorting this one.
SKF, FAG, NKE etc etc.

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